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HomeMy Public PortalAbout01-generalRevised 12/15/2014 10 THE METROPOLITAN ST. LOUIS SEWER DISTRICT 1. GENERAL The readers of this document should be aware that parts of this document may change from time to time. Those changes, including dates of revised pages and date of most recent change will be available on the District’s website by link at www.stlmsd.com . Design engineers must verify that they are using the most recent version. 1.010 Projects Requiring Review By the District All public or private sewerage and drainage works proposed to be constructed, altered or reconstructed by any person or corporation, public or private, within the District boundaries, require review by the District. This includes any altering of any storm drainage channel, site drainage or flood plain within those boundaries. 1.020 Regulations Governing the Use of Public and Private Sewerage Facilities The following sections are summarized from the District Sewer Use Ordinance. The current Sewer Use Ordinance in effect shall be considered the governing document and should be consulted for elaboration. Requests for variances or clarification of these regulations should be addressed to the attention of the Director with information supporting the request. A request for variance will be reviewed by the Director or his designee(s) and either granted or rejected in whole or part. 1.020.01 Unlawful Discharges and Sewage Disposal 1. Discharges and deposits of any sewage, industrial wastes, garbage, polluted water or any other substance that constitutes a nuisance or hazard to the public health or welfare into any natural outlet, drainage channel, or watercourse, are prohibited. 2. No cesspool, septic tank or other facility intended or used for the disposal of sewage shall be installed except as hereinafter provided. 1.020.02 Public Sewer Available A public sanitary or combined sewer shall be considered to be available if it is within two hundred (200) feet of any part of the property to be connected to the sewer. Under such conditions a direct connection must be made to the public sewer. Where an extension of the sewer system is required to make this connection, such extension shall be made public to insure other areas within the District of adequate sanitary disposal and conformance with 3.030.09.12. Combined sewers and storm sewers shall also comply with 3.030.09.12 with some exceptions for certain storm pipes. 1.020.03 Public Sewer Not Available Where a public sanitary or combined sewer is not available to service an existing or proposed residential property which is 3.0 acres or larger and if the District approves in writing, the sewer lateral from the building shall be connected to an approved private or semi-public sewer or sewage disposal or sewage treatment facility complying with the rules and regulations of the District and any other appropriate authority. When a public sewer becomes available and a direct connection to it is made, any septic tank, cesspool, or other private or semi-public sewage disposal or treatment facilities shall be abandoned as approved by the District. New residential lots that are less than 3.0 acres will be required to connect to the public sewer regardless of the proximity of the property to the public sewer. All new non-residential development and redevelopment or modification to an existing non- residential development will be required to connect to the public sewer, regardless of the proximity of the development to the public sewer. An exception will be made, however, for an Revised 12/15/2014 11 expansion of an existing building involving minimal extra water usage and where it’s original private treatment system is certified to still have adequate capacity after the proposed addition. 1.020.04 Prohibited Discharges and Waste Disposal Into Sanitary Sewers 1. Surface water, stormwater, groundwater, roof runoff, subsurface drainage, uncontaminated cooling water, unpolluted industrial process waters, shall not be discharged to a sanitary sewer. 2. No person shall deposit or throw into any sewer, or into any private drain connecting with a public sewer any waste, product or material of manufacture, rags or garbage which has not been properly shredded, or any substance which may constrict, cause a nuisance, dam or otherwise obstruct any sewer. 3. No gasoline service station, garage, car wash facility, refining plant, chemical plant, packing house, slaughter house, lard rendering establishment, dairy, steam plant, or any other establishment from which any substance would be discharged into the sewers which could tend to obstruct or damage the sewers, or cause a nuisance, or endanger the public health or safety, or endanger persons who might be in such sewers, shall be connected with any public sewer, or to any private sewer which discharges directly or indirectly into any public sewer. EXCEPTION would be through one or more District approved interceptors or traps. Any approved trap shall be maintained and operated in a manner satisfactory to the District, and the substance removed from such traps shall not be deposited in a way or place not previously approved by the District. Where grease, oil and grit interceptors, and other preliminary treatment facilities are provided, they shall be maintained continuously in satisfactory and efficient operation by the owner at his expense. Such facilities shall be subject to inspection by the District at all times. A Sampling appurtenance (“T” or manhole) may be required that would be easily accessible by the District. If the substance discharged by any establishment is deemed harmful to the sewer, detrimental to the public health or safety, and dangerous to persons who may enter such sewers, the discharge from such establishment shall be entirely excluded from the sewer. 1.020.05 Wastes Having Excessive Biochemical Oxygen Demand (B.O.D.), Suspended Solids or Toxic Elements If excessive B.O.D., suspended solids or toxic elements could occur and constitute a nuisance or adversely affect the operation of any existing force main, gravity system, sewage lift or pump station or proposed sewage treatment plant or overload any sewage treatment plant owned or operated by the District, the owner shall provide, at his expense, such preliminary treatment as may be necessary to: 1. Control objectionable characteristics or constituents in such a manner as to not obstruct or interfere with the maintenance or operation of any public sewerage facility. 2. Control the quantities and rates of discharge of such waters or wastes. Plans, specifications, and other pertinent information relating to proposed preliminary treatment facilities shall be submitted for the approval of the District, and construction of such facilities shall not commence until such approval is granted in writing. Revised 12/15/2014 12 1.020.06 Measurements, Tests or Analyses The District shall be provided means to monitor the discharge into the public sewers of any waters or wastes discharging into sewer or any treatment facility maintained and operated by the District that contain any quantity of substances having the characteristics described in Section 1.020.04, or have an average daily flow greater than two percent (2%) of the average daily sewage capacity of the treatment facility. All discharges shall be subject to the analytical inspection and approval of the District. Measurements, tests, and analyses of the characteristics of the water and wastes referred to in Sections 1.020.04 and 1.020.05 shall be determined in accordance with the current edition of "Standard Methods for Examination of Water and Wastewater" published jointly by the American Public Health Association, the American Water Works Association and the Water Environment Federation. Other approved testing methods as specified by the Environmental Protection Agency in 40 CFR PART 136 may also be used. Additional methods of making measurements, tests or analyses of the characteristics of water or wastes may be provided by the Director with the approval of the Board of Trustees of the District, when, in the opinion of the Director, they are necessary. All measurements, tests or analyses shall be upon suitable samples taken at the sampling appurtenance ("T" or manhole) All non-residential facilities shall have a six (6) inch (minimum) diameter, straight "T" vent or 42-inch (minimum) standard manhole for taking samples. This "T" vent or manhole shall be located on the lateral line outside the building. The "T" or manhole placement shall be before the lateral connects to the public sewer and downstream from any grease traps, interceptors, or any other private wastewater treatment system. 1.020.07 Furnishing Records It shall be the duty of every person, public utility or institution holding a permit to operate a sewerage system or sewage treatment plant to furnish records as may be required by the District to ascertain compliance with the rules and regulations and ordinances of the District. 1.030 Submission, Review and Approval of Plans and Specifications Designs, plans and specifications of all sewerage and drainage works proposed to be constructed, altered or reconstructed by any person or corporation, private or public, within District boundaries, shall be submitted to the District for review, revision, approval or rejection. In addition, for projects with facilities requiring industrial pretreatment, an Industrial Wastewater Survey Form must be completed and a set of plans submitted to the Division of Environmental Compliance of the District. Such designs, plans and specifications (excluding house connections, curb cuts, etc.) shall be prepared and sealed by a Professional Engineer, registered in the State of Missouri, and shall meet the minimum standards of the District and Missouri Department of Natural Resources before approval is granted. The District is designated as the Missouri Department of Natural Resources reviewing agency. Plans for projects that will be reviewed by the District, but will not require permits to be issued by the District and do not involve site grading and storm sewer construction, may be allowed to be sealed by an Architect registered in the State of Missouri. This will be up to the discretion of the District. A Surveyor’s seal is required for As-Built plans, but will not be accepted for Proposed Construction plans. The final set of plans submitted to the District for approval must be signed, sealed and dated by the Professional Engineer in accordance with the Missouri Revised Statutes, Chapter 327, of the Missouri Board for Architects, Professional Engineers, Professional Land Surveyors and Landscape Architects, except as above. Plans must be resubmitted if sealing date is more than a year old or if site or project conditions have changed. Missouri Rule 4 CSR 30-3.030 and MSD’s requirements will be deemed met if the following procedures are used. Place the original signature, wet seal and date on Revised 12/15/2014 13 each sheet of one set of final plans submitted for approval. Other sets may be reproductions, with wet seal, signature, and date only on the cover sheet along with a list of sheets which comprise the set. 1.040 Procedures 1.040.01 Preliminary Conferences Prior to formal submission of project plans, the owner's Engineer can request a preliminary conference to obtain informal guidance in project plan preparation. Preliminary conferences are encouraged in unique or unusual situations. Most projects, however, should not require a preliminary conference or conceptual approval, nor can more than a few be currently provided as a courtesy. Use of non-structural best management practices (BMPs) and site designs that conserve natural resources to meet water quality requirements are also encouraged. They are best considered by the Consultant and the Developer, prior to land disturbance at site; from the perspective of “Master” planning; and with a eye towards sustainability for the long term. This is in the ultimate Owner’s best interest. 1.040.02 Required Submittals by the Engineer Refer to the District's information sheet, the District Form (E.2), for information to be submitted. Plan Review may be delayed if all required information is not provided. To facilitate the review of plans before approval for construction, the Engineer shall submit with the plans all necessary data, maps and computations in support of the designs and plans. The following listed requested information is a minimum and may be supplemented by any additional information, which the Engineer considers to be helpful in the review process. 1. The following information shall be provided, as applicable: a. Engineer's name, mailing address, telephone number, fax number and contact name. b. Owner and/or developer's name, mailing address, telephone number, fax number and contact name. c. Accurate location of property relative to an intersection. d. "Wunnenberg's" page and grid number for the project, the District Base Map Number, the St. Louis County Locator Number for the property, and the property address. e. Total acreage of property, and impervious acres if other than residential. f. Land use of the improvement area, i.e.; commercial, residential, etc. g. For connection fee calculations: total number of dwelling units or lots, and domestic use water tap size (especially for non-residences, and not including fire and irrigation component). h. The District reference number shall be used in all subsequent correspondence concerning the project, and shall be utilized as soon as possible after issued. The St. Louis County Permit Application Center (PAC) number shall also be used as soon as possible. Revised 12/15/2014 14 i. If the submittal is a revision or addendum to a previous project, the previous project shall be properly identified, and the particulars of the revision or addendum shall be described. j. For any project, a very brief description giving scope and significant characteristics. 2. Number of Copies of Plans and Supporting Data to be Submitted. Plans shall be complete and a minimum of three (3) sets of plans and two (2) sets of the storm and sanitary hydraulic calculations will be required. Complete includes number and extent of multi-stories and basements or sub basements and lowest floor elevations. Flood Plain: Submit one (1) additional set of plans and a total of one (1) sets of The Flood Plain Report. Detention: Submit one (1) additional set of plans and a total of two (2) set of the detention calculations. Water Quality: Submit one (1) additional set of plans for BMPs and a total of two (2) sets of water quality calculations. Pump Station: Submit three (3) additional sets of plans and a total of four (4) copies of the pump station design report and specifications. 1.040.03 Subdivisions For projects within a proposed subdivision, a subdivision plat shall be provided substantially ready for filing, adequately dimensioned and located from well established points and lines to permit accurate platting on record maps. The Engineer shall provide a statement concerning the established zoning requirements of the governing municipality, including the City of St. Louis or St. Louis County, as appropriate, together with any other pertinent information. 1.040.04 Projects Normally Requiring a Sewer Connection - Permit Only Plans for connections to existing storm and/or sanitary sewers for commercial, industrial, public or private non-residential projects, for parking areas and for multiple-dwelling projects with paved areas shall show thereon: 1. Location, size and elevations of the existing sanitary, storm or combined sewer to which connections for the project are to be made. 2. The location, size and elevation of the required sanitary sewer connection at the point of origin. 3. The location, size and elevations of proposed storm drainage facilities. 4. Existing and proposed grade elevations with limits and direction of stormwater flows tributary to drainage facilities within the property. 5. Private sewers requiring permits from municipalities, the City of St. Louis, or St. Louis County may require project approval by such municipality or the County prior to submittal of permit application to the District. Revised 12/15/2014 15 1.040.05 Return of Plans Without Review Plans lacking the required information or those that are difficult to read or interpret due to poor drafting, poor arrangement or poor writing, will be returned without review for correction, additional information, or redrafting as may be required. 1.040.06 Return of Plans for Revision On completion of the review, one set of plans or a letter with comments with requested revisions and notations will be returned to the Engineer for revision of the original tracings. The assigned District reference number and Base Map number shall be shown in or near the Title Block upon resubmittal of the plans. Additional sets of plans for further review or final approval will then be requested. 1.040.07 Failure to Revise or Correct Plans Promptly Plans returned to the Owner's Engineer for revision, correction or additional information shall be modified and returned to the District within one year for final approval or the project will be considered abandoned. Further review will be continued only upon resubmittal as a new project, complete with all necessary data, submittal fee, review fee, etc. 1.040.08 Fees for Review See Chapter 9 for fees required for plan submittal and approval. 1.050 Plan Requirements 1.050.01 Drawing Sizes Plan sizes shall be uniform for each set. Where practical, plan and profile sheets 24" x 36" are preferred. No drawings shall exceed 36" x 42". When the sheet size is considerably smaller than 24" x 36", a size which is a multiple of 8½" x 11", or 11” x 17” is preferred for filing convenience. White line prints on blue background will not be approved. Good drafting practice, either manual or automated, at a suitable scale to facilitate the plan review and field construction shall be followed. The scale for a residential subdivision shall be a minimum of fifty (50) feet to the inch. The District reserves the right to require a larger scale to improve clarity. Not-to-scale (NTS) details are very strongly discouraged, and may be rejected. 1.050.02 Plans Submitted Shall Include: 1. Location of the project with respect to arterial roads, local streets, or subdivisions. 2. Key map of the entire project to scale, showing easements, sewer lines and facilities, both existing and to be constructed. 3. Recorder of Deeds book and page from City of St. Louis or St. Louis County for existing recorded easements when not part of a recorded subdivision plat. 4. Plans and profiles of each sewer line, channel or retaining wall showing location, size, flowline elevations, design flows for all segments, construction gradients, hydraulic grade lines, materials, proposed and original ground lines, boring information and rock elevations along the proposed sewer line, location, depths and sizes of adjacent or crossing sewer lines and utilities and special construction requirements such as a concrete cradle or encasement, type of backfill, strength class of pipe, etc. Sanitary or combined sewer profiles shall include the following information for each lateral connection: station, side (LT or RT), Lot Number, Basement Lowest Finished Floor Elevations and Property Address. Revised 12/15/2014 16 5. All elevations shall be based upon U.S.G.S. datum with location of the benchmark indicated on the plans. Acceptable benchmarks include those established by the District, St. Louis County Department of Highways and Traffic, Missouri State Highway and Transportation Department, or City of St. Louis Street Department. To convert from the City of St. Louis datum to U.S.G.S. datum, add 413. 69 feet to City of St. Louis datum (relates to Sandy Hook, New Jersey MSL.). 6. Profiles and typical cross-sections of existing and proposed swales, ditches or channels. 7. Details of special structures, channel improvements, culverts, transitions, headwalls, aprons and junction chambers, all adequately detailed and dimensioned, including placement of steel in reinforced concrete structures. Unless otherwise indicated, standard the District structures are assumed to be utilized. Use of not-to-scale (NTS) details will generally not be allowed. Past use and experience has shown resulting conflicts, misperceptions and unrealized poor to even unbuildable designs and otherwise unnecessary unexpected “field changes”. Details “practically drawn to scale” however, may use NTS, if key elevations and dimensions are shown. 8. A drainage area map showing original and proposed topography with drainage areas identified. 9. A subdivision plat, dimensioned and substantially complete and ready for filing. 10. The location of all utilities anticipated to be encountered during construction shall be shown. Plans must be submitted to all utility companies for verification of conflicts. Storm and sanitary sewers shall be located to comply with State laws and regulations governing such placement. 11. Plans must contain sufficient and verifiable, record information regarding size and location of existing water taps and their use to the project (to be used-in-place or destroyed) and the size of any proposed domestic water services and including service line(s), meter(s) and tap(s) to mains. 12. Details of all structural and non-structural best management practices (BMPs) for meeting water quality requirements. 13. Easement and other required exhibits and associated text, including specialized ones (e.g. pump station easements). 1.060 Storm Drainage Design Data, Maps and Computation (Also see Part 4 "Design Requirements For Storm Drainage Facilities") 1.060.01 General Criteria: The project drainage area map or maps shall accurately show the watershed boundary lines and areas tributary to each inlet, sewer and channel section. The established elevations, gradients and contours of the finished graded surfaces and streets shall be shown in support of the inlet drainage area lines and indicated directions of flow. The information shown shall be the same as given on a development plat usually required by financing agencies, which shows the project, the dwellings, streets, walks, finish grades at corners of the buildings, finish Revised 12/15/2014 17 contours, street elevations and gradients, inlet, sewer and utility locations. Sufficient information showing locations, elevations, cross-sections of downstream watercourses, channels, sewers, culverts, structures and adjoining land shall be provided to determine the effects of the stormwater discharge and the possible needs for special easement requirements and/or downstream drainage modifications or protection. 1.060.02 Basic Design Data To Include: 1. Rainfall frequency. 2. Tributary area in acres with percentage of imperviousness. 3. Runoff factor(s) used. 1.070 Sanitary Sewer Design Data, Maps and Computations (Also see Part 3 "Design Requirements For Sanitary Sewers") 1.070.01 General Criteria: Sufficient information shall be provided as to location, elevations, sizes, slopes, capacities, downstream pump stations and treatment facilities of the proposed project. 1.070.02 Basic Design Data To Consider: 1. Delineation of land use type(s). 2. Persons per dwelling unit. 3. Average and peak flow rate per person and per non-residential connection. 4. Commercial/Industrial User Wastewater Survey Letter (if applicable) if required. 5. Population equivalent for industrial/commercial areas, schools, parks, hotels/motel institutions, and/or public buildings. 6. Point of connection to existing or proposed sewer and capacity of outfall system, including effects on next pump station downstream if one exist. 7. Allowances for future extension of proposed sewer to serve upstream areas of the watershed shall include both capacity and physical access. Lowest floor elevations of homes near the project or along an outfall line may be required. 8. Treatment facility to receive flows. 9. Some sources of useful equivalents are in parts of the 10 State Standards, MDNR, the District Design and planning factors, et cetera.